genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors

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This is lifted from the blk-mq code and adopted to use the affinity mask
concept just introduced in the irq handling code.  It tries to keep the
algorithm the same as the one current used by blk-mq, but improvements
like assining vectors on a per-node basis instead of just per sibling
are possible with this simple move and refactoring.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: linux-block@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Cc: axboe@fb.com
Cc: agordeev@redhat.com
Link: http://lkml.kernel.org/r/1467621574-8277-7-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Christoph Hellwig 2016-07-04 17:39:27 +09:00 • committed by Thomas Gleixner

parent 0972fa57f5

commit 5e385a6ef3

3 changed files with 70 additions and 0 deletions

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8

include/linux/interrupt.h

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1

kernel/irq/Makefile

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61

kernel/irq/affinity.c

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